How To Fix /IWBEP/CM_MGW_RT159 - ABAP Dictionary type '&1' not supported (flat structure only)

/IWBEP/CM_MGW_RT159 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 159

• Message text: ABAP Dictionary type '&1' not supported (flat structure only)

Self-Explanatory Message

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/IWBEP/CM_MGW_RT159 - Details

• The SAP error message /IWBEP/CM_MGW_RT159 indicates that there is an issue with the ABAP Dictionary type being used in the context of an OData service. Specifically, the error states that the type is not supported because only flat structures are allowed.
  
  Cause:
  This error typically occurs when you are trying to expose a complex data type (like a nested structure or a table) in an OData service. OData services in SAP Gateway only support flat structures for the data types that can be exposed. If your ABAP Dictionary type is a complex type (e.g., it contains nested tables or structures), the OData service cannot process it, leading to this error.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Data Type: Review the ABAP Dictionary type that is causing the error. Ensure that it is a flat structure. If it is a complex type, you will need to modify it.
  
  
  Modify the